Bettas can often be very aggressive (since I'm assuming you have a male).
10g is rather small buy you have some options. There was a nice thread stickied with good options but I think the forum reset whipped it out.
For yours, if you want to stick with the betta you may be able to get away with some shrimp/algae eaters/ or some other bottom dweller. I think that previous thread listed shrimp and dwarf frogs as a good choice.
If you would rather go the route of schooling fish you could probably have one school of a smaller tetra (like neons) or guppies and be ok, just beware of the free lovin' lifestyle of the guppies. You could add a few (2-3) bottom dwellers in this tank as well.
Just some ideas, but with a smaller tank your options are much more limited and it is very very easy to overstock and problems associated with over stocking will appear much much quicker.
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